Common Rdbms Connection Problems

This section includes some general, as well as database-specific, suggestions for some of the more common problems with establishing a network connection to remote RDBMS databases.

The following list applies to all types of RDBMS connections:

Make sure that both the RdbmsNetwork and RdbmsDatabaseDevice have their Enabled property set to true.
Verify the network connection to the remote database by issuing an ICMP ping from your operating system.
Check that you have set the correct port number. Default port numbers (listed in Chapter 2 About the RdbmsNetwork) may not have been used when the database instance was initially configured.
Check with the database administrator (or owner of the database) to make sure that your login credentials have sufficient authorization for establishing a remote connection to the database.

The following list applies to SqlServer RDBMS connections:

If the RDBMS server is running a "named instance" of the database that you are trying to connect to, make sure that you have the correct Instance Name. If the property value field is empty, it is ignored and the database users default database as assigned to the user in SqlServer will be used.
In order for a Niagara AX station to connect, the Microsoft SQL Server instance must be configured for Mixed Mode Authentication. Refer to Types of RdbmsNetwork Driver Devices for more details.

NOTE: SqlServerExress, by default, provides named instances for databases. The default name provided is "SQLEXPRESS".